Hmmm ... I think we should be careful in our defining a 'Christian' versus defining a 'Believer'. Believers in the Messiah can include Christians, Messianic Jews, and other groups that are all rather different from one another in some doctrines yet all are trying to follow Scripture as best as they know.
This link goes to an article that delineates 'Christians' by their traditions rather than their stance on belief in Messiah:
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